Final answer:
Essential fatty acids, such as omega-3 and omega-6, are fatty acids that are required but not synthesized by the human body. They must be obtained through the diet. They are polyunsaturated fats and have important roles in human health.
Step-by-step explanation:
Essential fatty acids are fatty acids that are required but not synthesized by the human body. They must be supplemented through the diet. Omega-3 fatty acids are one type of essential fatty acid, along with omega-6 fatty acids. They are polyunsaturated fats and play important roles in human health.